{"note":"bim_versions 導入後の保存のみ記録 (それ以前は bim_canonical 上書きで履歴なし)","ok":true,"slug":"u-house-xbh4a5iy","versions":[{"created_at":"2026-06-10T18:29:56Z","element_count":90,"note":"5軸GA polish 53->98 by M5 (autonomous)","saved_by":"mcp","sha256":"5f27155ba03f4d9215df44d1ec2730818a42e3ee4dd2a64f44b888dfb8764ae3","version":3}]}